
\documentclass[tikz, x11names]{standalone}
\usetikzlibrary{decorations.pathmorphing}

\begin{document}
  \begin{tikzpicture}
    \fill[LightSteelBlue1] (-3,0) -- (0,4) -- (0,0) -- cycle;
    \fill[LightBlue1] (0,4) -- (4,1) -- (0,1) -- cycle;
    \fill[CadetBlue2] (4,1) -- (1,-3) -- (1,1) -- cycle;
    \fill[SkyBlue1] (1,-3) -- (-3,0) -- (1,0) -- cycle;
    \fill[LightSkyBlue1] (0,0) |- (1,1) |- cycle;
    \draw[DeepSkyBlue2, line width=9pt, decorate,
      decoration={random steps, segment length=5pt, amplitude=.5pt}]
      (-3,0) -- (0,4) -- (4,1) -- (1,-3) -- cycle
      (-3,0) -- (1,0) (0,4) -- (0,0) (4,1) -- (0,1) (1,-3) -- (1,1);
  \end{tikzpicture}
\end{document}
